It experiments a new kind of Concepts: the bodies only contain two minds, one Aphilian and one non-Aphilian. The first attempt is made with Homer G. Adams and an Aphilian woman named Sucanne Weiter. The double concept is sent to the Earth and Weiter quickly overpowers Adams and then tries to destroy the Terra Patrol in an attempt to restore the Aphily on the Earth.

After a psychic fight, Adams manages to destroy the mind of Weiter and regains control of his body.

On the Sol, still orbiting the Earth, Danton and Atlan decide to go after Rhodan and start their search for Bulloc.